61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
/*
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* Copyright (c) 2011, 2012, 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* x86-family/idt.cpp
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* Initializes and handles the interrupt descriptor table.
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*/
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#include <stdint.h>
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#include <string.h>
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#include "idt.h"
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namespace Sortix {
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namespace IDT {
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void Set(struct idt_entry* table, size_t length)
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{
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size_t limit = sizeof(idt_entry) * length - 1;
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#if defined(__x86_64__)
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asm volatile ("subq $10, %%rsp\n\t"
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"movw %w0, 0(%%rsp)\n\t"
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"movq %1, 2(%%rsp)\n\t"
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"lidt (%%rsp)\n\t"
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"addq $10, %%rsp" : : "rN"(limit), "r"(table));
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#else
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asm volatile ("subl $6, %%esp\n\t"
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"movw %w0, 0(%%esp)\n\t"
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"movl %1, 2(%%esp)\n\t"
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"lidt (%%esp)\n\t"
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"addl $6, %%esp" : : "rN"(limit), "r"(table));
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#endif
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}
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void SetEntry(struct idt_entry* entry, uintptr_t handler, uint16_t selector, uint8_t flags, uint8_t ist)
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{
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entry->flags = flags;
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entry->ist = ist;
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entry->selector = selector;
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entry->handler_low = handler >> 0 & 0xFFFF;
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entry->handler_high = handler >> 16 & 0xFFFF;
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#if defined(__x86_64__)
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entry->handler_highest = handler >> 32 & 0xFFFFFFFFU;
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entry->reserved1 = 0;
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#endif
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}
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} // namespace IDT
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} // namespace Sortix
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